Question $5$

$[6$ marks$]$

Consider the soil profile shown in the figure. Notice that the 'clayey sand' layer extends to a depth of

$4m$ below ground level. Assume a capillary head of $h_c=0\mathrm{.}5m$ and hydrostatic conditions. Also, assume

that the soil is fully dry above the capillary head and fully saturated below it$.$

a$)$ The total stress $$ at $2\mathrm{.}5m$ below ground level.

b$)$ The pore water pressure $u$ at $2\mathrm{.}5m$ below ground level.

c$)$ The effective stress ${}^{\text{'}}$ at $2\mathrm{.}5m$ below ground level.

d$)$ The total stress $$ at $4m$ below ground level.

e$)$ The pore water pressure $u$ at $4m$ below ground level.

f$)$ The effective stress ${}^{\text{'}}$ at $4m$ below ground level.